561481540985 has 16 divisors (see below), whose sum is σ = 676710118656. Its totient is φ = 447234361728.

The previous prime is 561481540973. The next prime is 561481540993. The reversal of 561481540985 is 589045184165.

561481540985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561481540985 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561481540985.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884234 + ... + 1380156.

It is an arithmetic number, because the mean of its divisors is an integer number (42294382416).

Almost surely, 2^561481540985 is an apocalyptic number.

It is an amenable number.

561481540985 is a deficient number, since it is larger than the sum of its proper divisors (115228577671).

561481540985 is a wasteful number, since it uses less digits than its factorization.

561481540985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496912.

The product of its (nonzero) digits is 6912000, while the sum is 56.

The spelling of 561481540985 in words is "five hundred sixty-one billion, four hundred eighty-one million, five hundred forty thousand, nine hundred eighty-five".